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  • ICAR and TNAU E-Course Summarized

    Summarized Notes
  • Which of the following plants does not grow from seeds?

    Question: Which of the following plants does not grow from seeds?

    Options:

    Pea
    Cauliflower
    tomato
    potato

    🔑 Key Points:

    → In potatoes, the underground portion is a modified stem.
    → It stores reserve food and has all the characteristics of a stem, including the presence of roots, shoots, and buds (called "eyes").
    → The potato is a tuber, and the green part (seen in young potatoes) carries out photosynthesis.
    → It is classified as a modified stem because it has scaly leaves, nodes, internodes, and adventitious roots—all characteristics of stems.
    → The potato tuber has buds in small pits known as eyes.
    → These buds develop into branches. Some of these branches become green, erect, and leafy stems that grow horizontally underground.

    📌 Additional Information:

    → The first step in plant growth is seed germination.
    → Seeds germinate when favorable environmental conditions are present.
    → In the absence of such conditions, seeds remain dormant, entering a period of suspended growth.
    → Once favorable conditions return, seeds resume metabolic activities and growth.
    → The root system begins developing from the embryonic root (called the radicle), which grows out of the seed after it absorbs water. This is the primary root of the new plant.
    → The tip of the root is protected by a mass of loose cells called the root cap.

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